refactor server to allow pluggable db and tracing (#1036)

* refactor server to allow pluggable db and tracing

* clean up

* fix descriptions

* remove dependencies

33 files changed, 760 insertions, 888 deletions

diff --git a/Cargo.lock b/Cargo.lock
index 16e67c25..a3ac81b1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -97,6 +97,7 @@ dependencies = [
  "atuin-client",
  "atuin-common",
  "atuin-server",
+ "atuin-server-postgres",
  "base64 0.21.0",
  "bitflags",
  "cassowary",
@@ -104,7 +105,6 @@ dependencies = [
  "clap",
  "clap_complete",
  "colored",
- "crossbeam-channel",
  "crossterm",
  "directories",
  "env_logger",
@@ -160,7 +160,6 @@ dependencies = [
  "serde_regex",
  "sha2",
  "shellexpand",
- "sodiumoxide",
  "sql-builder",
  "sqlx",
  "tokio",
@@ -187,6 +186,7 @@ dependencies = [
  "argon2",
  "async-trait",
  "atuin-common",
+ "atuin-server-database",
  "axum",
  "base64 0.21.0",
  "chrono",
@@ -200,14 +200,39 @@ dependencies = [
  "semver",
  "serde",
  "serde_json",
- "sodiumoxide",
- "sqlx",
  "tokio",
  "tower",
  "tower-http",
  "tracing",
  "uuid",
- "whoami",
+]
+
+[[package]]
+name = "atuin-server-database"
+version = "15.0.0"
+dependencies = [
+ "async-trait",
+ "atuin-common",
+ "chrono",
+ "chronoutil",
+ "eyre",
+ "serde",
+ "tracing",
+ "uuid",
+]
+
+[[package]]
+name = "atuin-server-postgres"
+version = "15.0.0"
+dependencies = [
+ "async-trait",
+ "atuin-common",
+ "atuin-server-database",
+ "chrono",
+ "futures-util",
+ "serde",
+ "sqlx",
+ "tracing",
 ]
 
 [[package]]
@@ -516,16 +541,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2d0165d2900ae6778e36e80bbc4da3b5eefccee9ba939761f9c2882a5d9af3ff"
 
 [[package]]
-name = "crossbeam-channel"
-version = "0.5.8"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a33c2bf77f2df06183c3aa30d1e96c0695a313d4f9c453cc3762a6db39f99200"
-dependencies = [
- "cfg-if",
- "crossbeam-utils",
-]
-
-[[package]]
 name = "crossbeam-queue"
 version = "0.3.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -632,15 +647,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "ed25519"
-version = "1.5.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1e9c280362032ea4203659fc489832d0204ef09f247a0506f170dafcac08c369"
-dependencies = [
- "signature",
-]
-
-[[package]]
 name = "either"
 version = "1.8.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1176,18 +1182,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3304a64d199bb964be99741b7a14d26972741915b3649639149b2479bb46f4b5"
 
 [[package]]
-name = "libsodium-sys"
-version = "0.2.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6b779387cd56adfbc02ea4a668e704f729be8d6a6abd2c27ca5ee537849a92fd"
-dependencies = [
- "cc",
- "libc",
- "pkg-config",
- "walkdir",
-]
-
-[[package]]
 name = "libsqlite3-sys"
 version = "0.24.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -1876,15 +1870,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "same-file"
-version = "1.0.6"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "93fc1dc3aaa9bfed95e02e6eadabb4baf7e3078b0bd1b4d7b6b0b68378900502"
-dependencies = [
- "winapi-util",
-]
-
-[[package]]
 name = "schannel"
 version = "0.1.20"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2072,12 +2057,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "signature"
-version = "1.6.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e90531723b08e4d6d71b791108faf51f03e1b4a7784f96b2b87f852ebc247228"
-
-[[package]]
 name = "slab"
 version = "0.4.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2103,18 +2082,6 @@ dependencies = [
 ]
 
 [[package]]
-name = "sodiumoxide"
-version = "0.2.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e26be3acb6c2d9a7aac28482586a7856436af4cfe7100031d219de2d2ecb0028"
-dependencies = [
- "ed25519",
- "libc",
- "libsodium-sys",
- "serde",
-]
-
-[[package]]
 name = "spin"
 version = "0.5.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
@@ -2660,17 +2627,6 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
 
 [[package]]
-name = "walkdir"
-version = "2.3.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "808cf2735cd4b6866113f648b791c6adc5714537bc222d9347bb203386ffda56"
-dependencies = [
- "same-file",
- "winapi",
- "winapi-util",
-]
-
-[[package]]
 name = "want"
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
diff --git a/Cargo.toml b/Cargo.toml
index 652efb8a..00b0434e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,5 +1,12 @@
 [workspace]
-members = ["atuin", "atuin-client", "atuin-server", "atuin-common"]
+members = [
+    "atuin",
+    "atuin-client",
+    "atuin-server",
+    "atuin-server-postgres",
+    "atuin-server-database",
+    "atuin-common",
+]
 
 [workspace.package]
 name = "atuin"
@@ -27,7 +34,6 @@ rand = { version = "0.8.5", features = ["std"] }
 semver = "1.0.14"
 serde = { version = "1.0.145", features = ["derive"] }
 serde_json = "1.0.86"
-sodiumoxide = "0.2.6"
 tokio = { version = "1", features = ["full"] }
 uuid = { version = "1.2", features = ["v4"] }
 whoami = "1.1.2"
diff --git a/atuin-client/Cargo.toml b/atuin-client/Cargo.toml
index fee3eb5f..770d7741 100644
--- a/atuin-client/Cargo.toml
+++ b/atuin-client/Cargo.toml
@@ -53,7 +53,6 @@ memchr = "2.5"
 
 # sync
 urlencoding = { version = "2.1.0", optional = true }
-sodiumoxide = { workspace = true, optional = true }
 reqwest = { workspace = true, optional = true }
 hex = { version = "0.4", optional = true }
 sha2 = { version = "0.10", optional = true }
diff --git a/atuin-server-database/Cargo.toml b/atuin-server-database/Cargo.toml
new file mode 100644
index 00000000..485b3246
--- /dev/null
+++ b/atuin-server-database/Cargo.toml
@@ -0,0 +1,21 @@
+[package]
+name = "atuin-server-database"
+edition = "2021"
+description = "server database library for atuin"
+
+version = { workspace = true }
+authors = { workspace = true }
+license = { workspace = true }
+homepage = { workspace = true }
+repository = { workspace = true }
+
+[dependencies]
+atuin-common = { path = "../atuin-common", version = "15.0.0" }
+
+tracing = "0.1"
+chrono = { workspace = true }
+eyre = { workspace = true }
+uuid = { workspace = true }
+serde = { workspace = true }
+async-trait = { workspace = true }
+chronoutil = "0.2.3"
diff --git a/atuin-server/src/calendar.rs b/atuin-server-database/src/calendar.rs
index 7c05dce3..7c05dce3 100644
--- a/atuin-server/src/calendar.rs
+++ b/atuin-server-database/src/calendar.rs
diff --git a/atuin-server-database/src/lib.rs b/atuin-server-database/src/lib.rs
new file mode 100644
index 00000000..de33ba44
--- /dev/null
+++ b/atuin-server-database/src/lib.rs
@@ -0,0 +1,220 @@
+#![forbid(unsafe_code)]
+
+pub mod calendar;
+pub mod models;
+
+use std::{
+    collections::HashMap,
+    fmt::{Debug, Display},
+};
+
+use self::{
+    calendar::{TimePeriod, TimePeriodInfo},
+    models::{History, NewHistory, NewSession, NewUser, Session, User},
+};
+use async_trait::async_trait;
+use atuin_common::utils::get_days_from_month;
+use chrono::{Datelike, TimeZone};
+use chronoutil::RelativeDuration;
+use serde::{de::DeserializeOwned, Serialize};
+use tracing::instrument;
+
+#[derive(Debug)]
+pub enum DbError {
+    NotFound,
+    Other(eyre::Report),
+}
+
+impl Display for DbError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{self:?}")
+    }
+}
+
+impl std::error::Error for DbError {}
+
+pub type DbResult<T> = Result<T, DbError>;
+
+#[async_trait]
+pub trait Database: Sized + Clone + Send + Sync + 'static {
+    type Settings: Debug + Clone + DeserializeOwned + Serialize + Send + Sync + 'static;
+    async fn new(settings: &Self::Settings) -> DbResult<Self>;
+
+    async fn get_session(&self, token: &str) -> DbResult<Session>;
+    async fn get_session_user(&self, token: &str) -> DbResult<User>;
+    async fn add_session(&self, session: &NewSession) -> DbResult<()>;
+
+    async fn get_user(&self, username: &str) -> DbResult<User>;
+    async fn get_user_session(&self, u: &User) -> DbResult<Session>;
+    async fn add_user(&self, user: &NewUser) -> DbResult<i64>;
+    async fn delete_user(&self, u: &User) -> DbResult<()>;
+
+    async fn count_history(&self, user: &User) -> DbResult<i64>;
+    async fn count_history_cached(&self, user: &User) -> DbResult<i64>;
+
+    async fn delete_history(&self, user: &User, id: String) -> DbResult<()>;
+    async fn deleted_history(&self, user: &User) -> DbResult<Vec<String>>;
+
+    async fn count_history_range(
+        &self,
+        user: &User,
+        start: chrono::NaiveDateTime,
+        end: chrono::NaiveDateTime,
+    ) -> DbResult<i64>;
+
+    async fn list_history(
+        &self,
+        user: &User,
+        created_after: chrono::NaiveDateTime,
+        since: chrono::NaiveDateTime,
+        host: &str,
+        page_size: i64,
+    ) -> DbResult<Vec<History>>;
+
+    async fn add_history(&self, history: &[NewHistory]) -> DbResult<()>;
+
+    async fn oldest_history(&self, user: &User) -> DbResult<History>;
+
+    /// Count the history for a given year
+    #[instrument(skip_all)]
+    async fn count_history_year(&self, user: &User, year: i32) -> DbResult<i64> {
+        let start = chrono::Utc.ymd(year, 1, 1).and_hms_nano(0, 0, 0, 0);
+        let end = start + RelativeDuration::years(1);
+
+        let res = self
+            .count_history_range(user, start.naive_utc(), end.naive_utc())
+            .await?;
+        Ok(res)
+    }
+
+    /// Count the history for a given month
+    #[instrument(skip_all)]
+    async fn count_history_month(&self, user: &User, month: chrono::NaiveDate) -> DbResult<i64> {
+        let start = chrono::Utc
+            .ymd(month.year(), month.month(), 1)
+            .and_hms_nano(0, 0, 0, 0);
+
+        // ofc...
+        let end = if month.month() < 12 {
+            chrono::Utc
+                .ymd(month.year(), month.month() + 1, 1)
+                .and_hms_nano(0, 0, 0, 0)
+        } else {
+            chrono::Utc
+                .ymd(month.year() + 1, 1, 1)
+                .and_hms_nano(0, 0, 0, 0)
+        };
+
+        tracing::debug!("start: {}, end: {}", start, end);
+
+        let res = self
+            .count_history_range(user, start.naive_utc(), end.naive_utc())
+            .await?;
+        Ok(res)
+    }
+
+    /// Count the history for a given day
+    #[instrument(skip_all)]
+    async fn count_history_day(&self, user: &User, day: chrono::NaiveDate) -> DbResult<i64> {
+        let start = chrono::Utc
+            .ymd(day.year(), day.month(), day.day())
+            .and_hms_nano(0, 0, 0, 0);
+        let end = chrono::Utc
+            .ymd(day.year(), day.month(), day.day() + 1)
+            .and_hms_nano(0, 0, 0, 0);
+
+        let res = self
+            .count_history_range(user, start.naive_utc(), end.naive_utc())
+            .await?;
+        Ok(res)
+    }
+
+    #[instrument(skip_all)]
+    async fn calendar(
+        &self,
+        user: &User,
+        period: TimePeriod,
+        year: u64,
+        month: u64,
+    ) -> DbResult<HashMap<u64, TimePeriodInfo>> {
+        // TODO: Support different timezones. Right now we assume UTC and
+        // everything is stored as such. But it _should_ be possible to
+        // interpret the stored date with a different TZ
+
+        match period {
+            TimePeriod::YEAR => {
+                let mut ret = HashMap::new();
+                // First we need to work out how far back to calculate. Get the
+                // oldest history item
+                let oldest = self.oldest_history(user).await?.timestamp.year();
+                let current_year = chrono::Utc::now().year();
+
+                // All the years we need to get data for
+                // The upper bound is exclusive, so include current +1
+                let years = oldest..current_year + 1;
+
+                for year in years {
+                    let count = self.count_history_year(user, year).await?;
+
+                    ret.insert(
+                        year as u64,
+                        TimePeriodInfo {
+                            count: count as u64,
+                            hash: "".to_string(),
+                        },
+                    );
+                }
+
+                Ok(ret)
+            }
+
+            TimePeriod::MONTH => {
+                let mut ret = HashMap::new();
+
+                for month in 1..13 {
+                    let count = self
+                        .count_history_month(
+                            user,
+                            chrono::Utc.ymd(year as i32, month, 1).naive_utc(),
+                        )
+                        .await?;
+
+                    ret.insert(
+                        month as u64,
+                        TimePeriodInfo {
+                            count: count as u64,
+                            hash: "".to_string(),
+                        },
+                    );
+                }
+
+                Ok(ret)
+            }
+
+            TimePeriod::DAY => {
+                let mut ret = HashMap::new();
+
+                for day in 1..get_days_from_month(year as i32, month as u32) {
+                    let count = self
+                        .count_history_day(
+                            user,
+                            chrono::Utc
+                                .ymd(year as i32, month as u32, day as u32)
+                                .naive_utc(),
+                        )
+                        .await?;
+
+                    ret.insert(
+                        day as u64,
+                        TimePeriodInfo {
+                            count: count as u64,
+                            hash: "".to_string(),
+                        },
+                    );
+                }
+
+                Ok(ret)
+            }
+        }
+    }
+}
diff --git a/atuin-server/src/models.rs b/atuin-server-database/src/models.rs
index ee84f58a..a95ceba2 100644
--- a/atuin-server/src/models.rs
+++ b/atuin-server-database/src/models.rs
@@ -1,6 +1,5 @@
 use chrono::prelude::*;
 
-#[derive(sqlx::FromRow)]
 pub struct History {
     pub id: i64,
     pub client_id: String, // a client generated ID
@@ -22,7 +21,6 @@ pub struct NewHistory {
     pub data: String,
 }
 
-#[derive(sqlx::FromRow)]
 pub struct User {
     pub id: i64,
     pub username: String,
@@ -30,7 +28,6 @@ pub struct User {
     pub password: String,
 }
 
-#[derive(sqlx::FromRow)]
 pub struct Session {
     pub id: i64,
     pub user_id: i64,
diff --git a/atuin-server-postgres/Cargo.toml b/atuin-server-postgres/Cargo.toml
new file mode 100644
index 00000000..18864f6c
--- /dev/null
+++ b/atuin-server-postgres/Cargo.toml
@@ -0,0 +1,21 @@
+[package]
+name = "atuin-server-postgres"
+edition = "2018"
+description = "server postgres database library for atuin"
+
+version = { workspace = true }
+authors = { workspace = true }
+license = { workspace = true }
+homepage = { workspace = true }
+repository = { workspace = true }
+
+[dependencies]
+atuin-common = { path = "../atuin-common", version = "15.0.0" }
+atuin-server-database = { path = "../atuin-server-database", version = "15.0.0" }
+
+tracing = "0.1"
+chrono = { workspace = true }
+serde = { workspace = true }
+sqlx = { workspace = true }
+async-trait = { workspace = true }
+futures-util = "0.3"
diff --git a/atuin-server/migrations/20210425153745_create_history.sql b/atuin-server-postgres/migrations/20210425153745_create_history.sql
index 2c2d17b0..2c2d17b0 100644
--- a/atuin-server/migrations/20210425153745_create_history.sql
+++ b/atuin-server-postgres/migrations/20210425153745_create_history.sql
diff --git a/atuin-server/migrations/20210425153757_create_users.sql b/atuin-server-postgres/migrations/20210425153757_create_users.sql
index a25dcced..a25dcced 100644
--- a/atuin-server/migrations/20210425153757_create_users.sql
+++ b/atuin-server-postgres/migrations/20210425153757_create_users.sql
diff --git a/atuin-server/migrations/20210425153800_create_sessions.sql b/atuin-server-postgres/migrations/20210425153800_create_sessions.sql
index c2fb6559..c2fb6559 100644
--- a/atuin-server/migrations/20210425153800_create_sessions.sql
+++ b/atuin-server-postgres/migrations/20210425153800_create_sessions.sql
diff --git a/atuin-server/migrations/20220419082412_add_count_trigger.sql b/atuin-server-postgres/migrations/20220419082412_add_count_trigger.sql
index dd1afa88..dd1afa88 100644
--- a/atuin-server/migrations/20220419082412_add_count_trigger.sql
+++ b/atuin-server-postgres/migrations/20220419082412_add_count_trigger.sql
diff --git a/atuin-server/migrations/20220421073605_fix_count_trigger_delete.sql b/atuin-server-postgres/migrations/20220421073605_fix_count_trigger_delete.sql
index 6198f300..6198f300 100644
--- a/atuin-server/migrations/20220421073605_fix_count_trigger_delete.sql
+++ b/atuin-server-postgres/migrations/20220421073605_fix_count_trigger_delete.sql
diff --git a/atuin-server/migrations/20220421174016_larger-commands.sql b/atuin-server-postgres/migrations/20220421174016_larger-commands.sql
index 0ac43433..0ac43433 100644
--- a/atuin-server/migrations/20220421174016_larger-commands.sql
+++ b/atuin-server-postgres/migrations/20220421174016_larger-commands.sql
diff --git a/atuin-server/migrations/20220426172813_user-created-at.sql b/atuin-server-postgres/migrations/20220426172813_user-created-at.sql
index a9138194..a9138194 100644
--- a/atuin-server/migrations/20220426172813_user-created-at.sql
+++ b/atuin-server-postgres/migrations/20220426172813_user-created-at.sql
diff --git a/atuin-server/migrations/20220505082442_create-events.sql b/atuin-server-postgres/migrations/20220505082442_create-events.sql
index 57e16ec7..57e16ec7 100644
--- a/atuin-server/migrations/20220505082442_create-events.sql
+++ b/atuin-server-postgres/migrations/20220505082442_create-events.sql
diff --git a/atuin-server/migrations/20220610074049_history-length.sql b/atuin-server-postgres/migrations/20220610074049_history-length.sql
index b1c23016..b1c23016 100644
--- a/atuin-server/migrations/20220610074049_history-length.sql
+++ b/atuin-server-postgres/migrations/20220610074049_history-length.sql
diff --git a/atuin-server/migrations/20230315220537_drop-events.sql b/atuin-server-postgres/migrations/20230315220537_drop-events.sql
index fe3cae17..fe3cae17 100644
--- a/atuin-server/migrations/20230315220537_drop-events.sql
+++ b/atuin-server-postgres/migrations/20230315220537_drop-events.sql
diff --git a/atuin-server/migrations/20230315224203_create-deleted.sql b/atuin-server-postgres/migrations/20230315224203_create-deleted.sql
index 9a9e6263..9a9e6263 100644
--- a/atuin-server/migrations/20230315224203_create-deleted.sql
+++ b/atuin-server-postgres/migrations/20230315224203_create-deleted.sql
diff --git a/atuin-server/migrations/20230515221038_trigger-delete-only.sql b/atuin-server-postgres/migrations/20230515221038_trigger-delete-only.sql
index 3d0bba52..3d0bba52 100644
--- a/atuin-server/migrations/20230515221038_trigger-delete-only.sql
+++ b/atuin-server-postgres/migrations/20230515221038_trigger-delete-only.sql
diff --git a/atuin-server-postgres/src/lib.rs b/atuin-server-postgres/src/lib.rs
new file mode 100644
index 00000000..0dc51daf
--- /dev/null
+++ b/atuin-server-postgres/src/lib.rs
@@ -0,0 +1,332 @@
+use async_trait::async_trait;
+use atuin_server_database::models::{History, NewHistory, NewSession, NewUser, Session, User};
+use atuin_server_database::{Database, DbError, DbResult};
+use futures_util::TryStreamExt;
+use serde::{Deserialize, Serialize};
+use sqlx::postgres::PgPoolOptions;
+
+use sqlx::Row;
+
+use tracing::instrument;
+use wrappers::{DbHistory, DbSession, DbUser};
+
+mod wrappers;
+
+#[derive(Clone)]
+pub struct Postgres {
+    pool: sqlx::Pool<sqlx::postgres::Postgres>,
+}
+
+#[derive(Clone, Debug, Deserialize, Serialize)]
+pub struct PostgresSettings {
+    pub db_uri: String,
+}
+
+fn fix_error(error: sqlx::Error) -> DbError {
+    match error {
+        sqlx::Error::RowNotFound => DbError::NotFound,
+        error => DbError::Other(error.into()),
+    }
+}
+
+#[async_trait]
+impl Database for Postgres {
+    type Settings = PostgresSettings;
+    async fn new(settings: &PostgresSettings) -> DbResult<Self> {
+        let pool = PgPoolOptions::new()
+            .max_connections(100)
+            .connect(settings.db_uri.as_str())
+            .await
+            .map_err(fix_error)?;
+
+        sqlx::migrate!("./migrations")
+            .run(&pool)
+            .await
+            .map_err(|error| DbError::Other(error.into()))?;
+
+        Ok(Self { pool })
+    }
+
+    #[instrument(skip_all)]
+    async fn get_session(&self, token: &str) -> DbResult<Session> {
+        sqlx::query_as("select id, user_id, token from sessions where token = $1")
+            .bind(token)
+            .fetch_one(&self.pool)
+            .await
+            .map_err(fix_error)
+            .map(|DbSession(session)| session)
+    }
+
+    #[instrument(skip_all)]
+    async fn get_user(&self, username: &str) -> DbResult<User> {
+        sqlx::query_as("select id, username, email, password from users where username = $1")
+            .bind(username)
+            .fetch_one(&self.pool)
+            .await
+            .map_err(fix_error)
+            .map(|DbUser(user)| user)
+    }
+
+    #[instrument(skip_all)]
+    async fn get_session_user(&self, token: &str) -> DbResult<User> {
+        sqlx::query_as(
+            "select users.id, users.username, users.email, users.password from users 
+            inner join sessions 
+            on users.id = sessions.user_id 
+            and sessions.token = $1",
+        )
+        .bind(token)
+        .fetch_one(&self.pool)
+        .await
+        .map_err(fix_error)
+        .map(|DbUser(user)| user)
+    }
+
+    #[instrument(skip_all)]
+    async fn count_history(&self, user: &User) -> DbResult<i64> {
+        // The cache is new, and the user might not yet have a cache value.
+        // They will have one as soon as they post up some new history, but handle that
+        // edge case.
+
+        let res: (i64,) = sqlx::query_as(
+            "select count(1) from history
+            where user_id = $1",
+        )
+        .bind(user.id)
+        .fetch_one(&self.pool)
+        .await
+        .map_err(fix_error)?;
+
+        Ok(res.0)
+    }
+
+    #[instrument(skip_all)]
+    async fn count_history_cached(&self, user: &User) -> DbResult<i64> {
+        let res: (i32,) = sqlx::query_as(
+            "select total from total_history_count_user
+            where user_id = $1",
+        )
+        .bind(user.id)
+        .fetch_one(&self.pool)
+        .await
+        .map_err(fix_error)?;
+
+        Ok(res.0 as i64)
+    }
+
+    async fn delete_history(&self, user: &User, id: String) -> DbResult<()> {
+        sqlx::query(
+            "update history
+            set deleted_at = $3
+            where user_id = $1
+            and client_id = $2
+            and deleted_at is null", // don't just keep setting it
+        )
+        .bind(user.id)
+        .bind(id)
+        .bind(chrono::Utc::now().naive_utc())
+        .fetch_all(&self.pool)
+        .await
+        .map_err(fix_error)?;
+
+        Ok(())
+    }
+
+    #[instrument(skip_all)]
+    async fn deleted_history(&self, user: &User) -> DbResult<Vec<String>> {
+        // The cache is new, and the user might not yet have a cache value.
+        // They will have one as soon as they post up some new history, but handle that
+        // edge case.
+
+        let res = sqlx::query(
+            "select client_id from history 
+            where user_id = $1
+            and deleted_at is not null",
+        )
+        .bind(user.id)
+        .fetch_all(&self.pool)
+        .await
+        .map_err(fix_error)?;
+
+        let res = res
+            .iter()
+            .map(|row| row.get::<String, _>("client_id"))
+            .collect();
+
+        Ok(res)
+    }
+
+    #[instrument(skip_all)]
+    async fn count_history_range(
+        &self,
+        user: &User,
+        start: chrono::NaiveDateTime,
+        end: chrono::NaiveDateTime,
+    ) -> DbResult<i64> {
+        let res: (i64,) = sqlx::query_as(
+            "select count(1) from history
+            where user_id = $1
+            and timestamp >= $2::date
+            and timestamp < $3::date",
+        )
+        .bind(user.id)
+        .bind(start)
+        .bind(end)
+        .fetch_one(&self.pool)
+        .await
+        .map_err(fix_error)?;
+
+        Ok(res.0)
+    }
+
+    #[instrument(skip_all)]
+    async fn list_history(
+        &self,
+        user: &User,
+        created_after: chrono::NaiveDateTime,
+        since: chrono::NaiveDateTime,
+        host: &str,
+        page_size: i64,
+    ) -> DbResult<Vec<History>> {
+        let res = sqlx::query_as(
+            "select id, client_id, user_id, hostname, timestamp, data, created_at from history 
+            where user_id = $1
+            and hostname != $2
+            and created_at >= $3
+            and timestamp >= $4
+            order by timestamp asc
+            limit $5",
+        )
+        .bind(user.id)
+        .bind(host)
+        .bind(created_after)
+        .bind(since)
+        .bind(page_size)
+        .fetch(&self.pool)
+        .map_ok(|DbHistory(h)| h)
+        .try_collect()
+        .await
+        .map_err(fix_error)?;
+
+        Ok(res)
+    }
+
+    #[instrument(skip_all)]
+    async fn add_history(&self, history: &[NewHistory]) -> DbResult<()> {
+        let mut tx = self.pool.begin().await.map_err(fix_error)?;
+
+        for i in history {
+            let client_id: &str = &i.client_id;
+            let hostname: &str = &i.hostname;
+            let data: &str = &i.data;
+
+            sqlx::query(
+                "insert into history
+                    (client_id, user_id, hostname, timestamp, data) 
+                values ($1, $2, $3, $4, $5)
+                on conflict do nothing
+                ",
+            )
+            .bind(client_id)
+            .bind(i.user_id)
+            .bind(hostname)
+            .bind(i.timestamp)
+            .bind(data)
+            .execute(&mut tx)
+            .await
+            .map_err(fix_error)?;
+        }
+
+        tx.commit().await.map_err(fix_error)?;
+
+        Ok(())
+    }
+
+    #[instrument(skip_all)]
+    async fn delete_user(&self, u: &User) -> DbResult<()> {
+        sqlx::query("delete from sessions where user_id = $1")
+            .bind(u.id)
+            .execute(&self.pool)
+            .await
+            .map_err(fix_error)?;
+
+        sqlx::query("delete from users where id = $1")
+            .bind(u.id)
+            .execute(&self.pool)
+            .await
+            .map_err(fix_error)?;
+
+        sqlx::query("delete from history where user_id = $1")
+            .bind(u.id)
+            .execute(&self.pool)
+            .await
+            .map_err(fix_error)?;
+
+        Ok(())
+    }
+
+    #[instrument(skip_all)]
+    async fn add_user(&self, user: &NewUser) -> DbResult<i64> {
+        let email: &str = &user.email;
+        let username: &str = &user.username;
+        let password: &str = &user.password;
+
+        let res: (i64,) = sqlx::query_as(
+            "insert into users
+                (username, email, password)
+            values($1, $2, $3)
+            returning id",
+        )
+        .bind(username)
+        .bind(email)
+        .bind(password)
+        .fetch_one(&self.pool)
+        .await
+        .map_err(fix_error)?;
+
+        Ok(res.0)
+    }
+
+    #[instrument(skip_all)]
+    async fn add_session(&self, session: &NewSession) -> DbResult<()> {
+        let token: &str = &session.token;
+
+        sqlx::query(
+            "insert into sessions
+                (user_id, token)
+            values($1, $2)",
+        )
+        .bind(session.user_id)
+        .bind(token)
+        .execute(&self.pool)
+        .await
+        .map_err(fix_error)?;
+
+        Ok(())
+    }
+
+    #[instrument(skip_all)]
+    async fn get_user_session(&self, u: &User) -> DbResult<Session> {
+        sqlx::query_as("select id, user_id, token from sessions where user_id = $1")
+            .bind(u.id)
+            .fetch_one(&self.pool)
+            .await
+            .map_err(fix_error)
+            .map(|DbSession(session)| session)
+    }
+
+    #[instrument(skip_all)]
+    async fn oldest_history(&self, user: &User) -> DbResult<History> {
+        sqlx::query_as(
+            "select id, client_id, user_id, hostname, timestamp, data, created_at from history 
+            where user_id = $1
+            order by timestamp asc
+            limit 1",
+        )
+        .bind(user.id)
+        .fetch_one(&self.pool)
+        .await
+        .map_err(fix_error)
+        .map(|DbHistory(h)| h)
+    }
+}
diff --git a/atuin-server-postgres/src/wrappers.rs b/atuin-server-postgres/src/wrappers.rs
new file mode 100644
index 00000000..cb3d5a96
--- /dev/null
+++ b/atuin-server-postgres/src/wrappers.rs
@@ -0,0 +1,42 @@
+use ::sqlx::{FromRow, Result};
+use atuin_server_database::models::{History, Session, User};
+use sqlx::{postgres::PgRow, Row};
+
+pub struct DbUser(pub User);
+pub struct DbSession(pub Session);
+pub struct DbHistory(pub History);
+
+impl<'a> FromRow<'a, PgRow> for DbUser {
+    fn from_row(row: &'a PgRow) -> Result<Self> {
+        Ok(Self(User {
+            id: row.try_get("id")?,
+            username: row.try_get("username")?,
+            email: row.try_get("email")?,
+            password: row.try_get("password")?,
+        }))
+    }
+}
+
+impl<'a> ::sqlx::FromRow<'a, PgRow> for DbSession {
+    fn from_row(row: &'a PgRow) -> ::sqlx::Result<Self> {
+        Ok(Self(Session {
+            id: row.try_get("id")?,
+            user_id: row.try_get("user_id")?,
+            token: row.try_get("token")?,
+        }))
+    }
+}
+
+impl<'a> ::sqlx::FromRow<'a, PgRow> for DbHistory {
+    fn from_row(row: &'a PgRow) -> ::sqlx::Result<Self> {
+        Ok(Self(History {
+            id: row.try_get("id")?,
+            client_id: row.try_get("client_id")?,
+            user_id: row.try_get("user_id")?,
+            hostname: row.try_get("hostname")?,
+            timestamp: row.try_get("timestamp")?,
+            data: row.try_get("data")?,
+            created_at: row.try_get("created_at")?,
+        }))
+    }
+}
diff --git a/atuin-server/Cargo.toml b/atuin-server/Cargo.toml
index e4cbf3e0..f308fa30 100644
--- a/atuin-server/Cargo.toml
+++ b/atuin-server/Cargo.toml
@@ -11,20 +11,18 @@ repository = { workspace = true }
 
 [dependencies]
 atuin-common = { path = "../atuin-common", version = "15.0.0" }
+atuin-server-database = { path = "../atuin-server-database", version = "15.0.0" }
 
 tracing = "0.1"
 chrono = { workspace = true }
 eyre = { workspace = true }
 uuid = { workspace = true }
-whoami = { workspace = true }
 config = { workspace = true }
 serde = { workspace = true }
 serde_json = { workspace = true }
-sodiumoxide = { workspace = true }
 base64 = { workspace = true }
 rand = { workspace = true }
 tokio = { workspace = true }
-sqlx = { workspace = true }
 async-trait = { workspace = true }
 axum = "0.6.4"
 http = "0.2"
diff --git a/atuin-server/src/auth.rs b/atuin-server/src/auth.rs
deleted file mode 100644
index 52a73108..00000000
--- a/atuin-server/src/auth.rs
+++ /dev/null
@@ -1,222 +0,0 @@
-/*
-use self::diesel::prelude::*;
-use eyre::Result;
-use rocket::http::Status;
-use rocket::request::{self, FromRequest, Outcome, Request};
-use rocket::State;
-use rocket_contrib::databases::diesel;
-use sodiumoxide::crypto::pwhash::argon2id13;
-
-use rocket_contrib::json::Json;
-use uuid::Uuid;
-
-use super::models::{NewSession, NewUser, Session, User};
-use super::views::ApiResponse;
-
-use crate::api::{LoginRequest, RegisterRequest};
-use crate::schema::{sessions, users};
-use crate::settings::Settings;
-use crate::utils::hash_secret;
-
-use super::database::AtuinDbConn;
-
-#[derive(Debug)]
-pub enum KeyError {
-    Missing,
-    Invalid,
-}
-
-pub fn verify_str(secret: &str, verify: &str) -> bool {
-    sodiumoxide::init().unwrap();
-
-    let mut padded = [0_u8; 128];
-    secret.as_bytes().iter().enumerate().for_each(|(i, val)| {
-        padded[i] = *val;
-    });
-
-    match argon2id13::HashedPassword::from_slice(&padded) {
-        Some(hp) => argon2id13::pwhash_verify(&hp, verify.as_bytes()),
-        None => false,
-    }
-}
-
-impl<'a, 'r> FromRequest<'a, 'r> for User {
-    type Error = KeyError;
-
-    fn from_request(request: &'a Request<'r>) -> request::Outcome<User, Self::Error> {
-        let session: Vec<_> = request.headers().get("authorization").collect();
-
-        if session.is_empty() {
-            return Outcome::Failure((Status::BadRequest, KeyError::Missing));
-        } else if session.len() > 1 {
-            return Outcome::Failure((Status::BadRequest, KeyError::Invalid));
-        }
-
-        let session: Vec<_> = session[0].split(' ').collect();
-
-        if session.len() != 2 {
-            return Outcome::Failure((Status::BadRequest, KeyError::Invalid));
-        }
-
-        if session[0] != "Token" {
-            return Outcome::Failure((Status::BadRequest, KeyError::Invalid));
-        }
-
-        let session = session[1];
-
-        let db = request
-            .guard::<AtuinDbConn>()
-            .succeeded()
-            .expect("failed to load database");
-
-        let session = sessions::table
-            .filter(sessions::token.eq(session))
-            .first::<Session>(&*db);
-
-        if session.is_err() {
-            return Outcome::Failure((Status::Unauthorized, KeyError::Invalid));
-        }
-
-        let session = session.unwrap();
-
-        let user = users::table.find(session.user_id).first(&*db);
-
-        match user {
-            Ok(user) => Outcome::Success(user),
-            Err(_) => Outcome::Failure((Status::Unauthorized, KeyError::Invalid)),
-        }
-    }
-}
-
-#[get("/user/<user>")]
-#[allow(clippy::clippy::needless_pass_by_value)]
-pub fn get_user(user: String, conn: AtuinDbConn) -> ApiResponse {
-    use crate::schema::users::dsl::{username, users};
-
-    let user: Result<String, diesel::result::Error> = users
-        .select(username)
-        .filter(username.eq(user))
-        .first(&*conn);
-
-    if user.is_err() {
-        return ApiResponse {
-            json: json!({
-                "message": "could not find user",
-            }),
-            status: Status::NotFound,
-        };
-    }
-
-    let user = user.unwrap();
-
-    ApiResponse {
-        json: json!({ "username": user.as_str() }),
-        status: Status::Ok,
-    }
-}
-
-#[post("/register", data = "<register>")]
-#[allow(clippy::clippy::needless_pass_by_value)]
-pub fn register(
-    conn: AtuinDbConn,
-    register: Json<RegisterRequest>,
-    settings: State<Settings>,
-) -> ApiResponse {
-    if !settings.server.open_registration {
-        return ApiResponse {
-            status: Status::BadRequest,
-            json: json!({
-                "message": "registrations are not open"
-            }),
-        };
-    }
-
-    let hashed = hash_secret(register.password.as_str());
-
-    let new_user = NewUser {
-        email: register.email.as_str(),
-        username: register.username.as_str(),
-        password: hashed.as_str(),
-    };
-
-    let user = diesel::insert_into(users::table)
-        .values(&new_user)
-        .get_result(&*conn);
-
-    if user.is_err() {
-        return ApiResponse {
-            status: Status::BadRequest,
-            json: json!({
-                "message": "failed to create user - username or email in use?",
-            }),
-        };
-    }
-
-    let user: User = user.unwrap();
-    let token = Uuid::new_v4().to_simple().to_string();
-
-    let new_session = NewSession {
-        user_id: user.id,
-        token: token.as_str(),
-    };
-
-    match diesel::insert_into(sessions::table)
-        .values(&new_session)
-        .execute(&*conn)
-    {
-        Ok(_) => ApiResponse {
-            status: Status::Ok,
-            json: json!({"message": "user created!", "session": token}),
-        },
-        Err(_) => ApiResponse {
-            status: Status::BadRequest,
-            json: json!({ "message": "failed to create user"}),
-        },
-    }
-}
-
-#[post("/login", data = "<login>")]
-#[allow(clippy::clippy::needless_pass_by_value)]
-pub fn login(conn: AtuinDbConn, login: Json<LoginRequest>) -> ApiResponse {
-    let user = users::table
-        .filter(users::username.eq(login.username.as_str()))
-        .first(&*conn);
-
-    if user.is_err() {
-        return ApiResponse {
-            status: Status::NotFound,
-            json: json!({"message": "user not found"}),
-        };
-    }
-
-    let user: User = user.unwrap();
-
-    let session = sessions::table
-        .filter(sessions::user_id.eq(user.id))
-        .first(&*conn);
-
-    // a session should exist...
-    if session.is_err() {
-        return ApiResponse {
-            status: Status::InternalServerError,
-            json: json!({"message": "something went wrong"}),
-        };
-    }
-
-    let verified = verify_str(user.password.as_str(), login.password.as_str());
-
-    if !verified {
-        return ApiResponse {
-            status: Status::NotFound,
-            json: json!({"message": "user not found"}),
-        };
-    }
-
-    let session: Session = session.unwrap();
-
-    ApiResponse {
-        status: Status::Ok,
-        json: json!({"session": session.token}),
-    }
-}
-*/
diff --git a/atuin-server/src/database.rs b/atuin-server/src/database.rs
deleted file mode 100644
index 894fab7b..00000000
--- a/atuin-server/src/database.rs
+++ /dev/null
@@ -1,510 +0,0 @@
-use std::collections::HashMap;
-
-use async_trait::async_trait;
-use chrono::{Datelike, TimeZone};
-use chronoutil::RelativeDuration;
-use sqlx::{postgres::PgPoolOptions, Result};
-
-use sqlx::Row;
-
-use tracing::{debug, instrument, warn};
-
-use super::{
-    calendar::{TimePeriod, TimePeriodInfo},
-    models::{History, NewHistory, NewSession, NewUser, Session, User},
-};
-use crate::settings::Settings;
-
-use atuin_common::utils::get_days_from_month;
-
-#[async_trait]
-pub trait Database {
-    async fn get_session(&self, token: &str) -> Result<Session>;
-    async fn get_session_user(&self, token: &str) -> Result<User>;
-    async fn add_session(&self, session: &NewSession) -> Result<()>;
-
-    async fn get_user(&self, username: &str) -> Result<User>;
-    async fn get_user_session(&self, u: &User) -> Result<Session>;
-    async fn add_user(&self, user: &NewUser) -> Result<i64>;
-    async fn delete_user(&self, u: &User) -> Result<()>;
-
-    async fn count_history(&self, user: &User) -> Result<i64>;
-    async fn count_history_cached(&self, user: &User) -> Result<i64>;
-
-    async fn delete_history(&self, user: &User, id: String) -> Result<()>;
-    async fn deleted_history(&self, user: &User) -> Result<Vec<String>>;
-
-    async fn count_history_range(
-        &self,
-        user: &User,
-        start: chrono::NaiveDateTime,
-        end: chrono::NaiveDateTime,
-    ) -> Result<i64>;
-    async fn count_history_day(&self, user: &User, date: chrono::NaiveDate) -> Result<i64>;
-    async fn count_history_month(&self, user: &User, date: chrono::NaiveDate) -> Result<i64>;
-    async fn count_history_year(&self, user: &User, year: i32) -> Result<i64>;
-
-    async fn list_history(
-        &self,
-        user: &User,
-        created_after: chrono::NaiveDateTime,
-        since: chrono::NaiveDateTime,
-        host: &str,
-        page_size: i64,
-    ) -> Result<Vec<History>>;
-
-    async fn add_history(&self, history: &[NewHistory]) -> Result<()>;
-
-    async fn oldest_history(&self, user: &User) -> Result<History>;
-
-    async fn calendar(
-        &self,
-        user: &User,
-        period: TimePeriod,
-        year: u64,
-        month: u64,
-    ) -> Result<HashMap<u64, TimePeriodInfo>>;
-}
-
-#[derive(Clone)]
-pub struct Postgres {
-    pool: sqlx::Pool<sqlx::postgres::Postgres>,
-    settings: Settings,
-}
-
-impl Postgres {
-    pub async fn new(settings: Settings) -> Result<Self> {
-        let pool = PgPoolOptions::new()
-            .max_connections(100)
-            .connect(settings.db_uri.as_str())
-            .await?;
-
-        sqlx::migrate!("./migrations").run(&pool).await?;
-
-        Ok(Self { pool, settings })
-    }
-}
-
-#[async_trait]
-impl Database for Postgres {
-    #[instrument(skip_all)]
-    async fn get_session(&self, token: &str) -> Result<Session> {
-        sqlx::query_as::<_, Session>("select id, user_id, token from sessions where token = $1")
-            .bind(token)
-            .fetch_one(&self.pool)
-            .await
-    }
-
-    #[instrument(skip_all)]
-    async fn get_user(&self, username: &str) -> Result<User> {
-        sqlx::query_as::<_, User>(
-            "select id, username, email, password from users where username = $1",
-        )
-        .bind(username)
-        .fetch_one(&self.pool)
-        .await
-    }
-
-    #[instrument(skip_all)]
-    async fn get_session_user(&self, token: &str) -> Result<User> {
-        sqlx::query_as::<_, User>(
-            "select users.id, users.username, users.email, users.password from users 
-            inner join sessions 
-            on users.id = sessions.user_id 
-            and sessions.token = $1",
-        )
-        .bind(token)
-        .fetch_one(&self.pool)
-        .await
-    }
-
-    #[instrument(skip_all)]
-    async fn count_history(&self, user: &User) -> Result<i64> {
-        // The cache is new, and the user might not yet have a cache value.
-        // They will have one as soon as they post up some new history, but handle that
-        // edge case.
-
-        let res: (i64,) = sqlx::query_as(
-            "select count(1) from history
-            where user_id = $1",
-        )
-        .bind(user.id)
-        .fetch_one(&self.pool)
-        .await?;
-
-        Ok(res.0)
-    }
-
-    #[instrument(skip_all)]
-    async fn count_history_cached(&self, user: &User) -> Result<i64> {
-        let res: (i32,) = sqlx::query_as(
-            "select total from total_history_count_user
-            where user_id = $1",
-        )
-        .bind(user.id)
-        .fetch_one(&self.pool)
-        .await?;
-
-        Ok(res.0 as i64)
-    }
-
-    async fn delete_history(&self, user: &User, id: String) -> Result<()> {
-        sqlx::query(
-            "update history
-            set deleted_at = $3
-            where user_id = $1
-            and client_id = $2
-            and deleted_at is null", // don't just keep setting it
-        )
-        .bind(user.id)
-        .bind(id)
-        .bind(chrono::Utc::now().naive_utc())
-        .fetch_all(&self.pool)
-        .await?;
-
-        Ok(())
-    }
-
-    #[instrument(skip_all)]
-    async fn deleted_history(&self, user: &User) -> Result<Vec<String>> {
-        // The cache is new, and the user might not yet have a cache value.
-        // They will have one as soon as they post up some new history, but handle that
-        // edge case.
-
-        let res = sqlx::query(
-            "select client_id from history 
-            where user_id = $1
-            and deleted_at is not null",
-        )
-        .bind(user.id)
-        .fetch_all(&self.pool)
-        .await?;
-
-        let res = res
-            .iter()
-            .map(|row| row.get::<String, _>("client_id"))
-            .collect();
-
-        Ok(res)
-    }
-
-    #[instrument(skip_all)]
-    async fn count_history_range(
-        &self,
-        user: &User,
-        start: chrono::NaiveDateTime,
-        end: chrono::NaiveDateTime,
-    ) -> Result<i64> {
-        let res: (i64,) = sqlx::query_as(
-            "select count(1) from history
-            where user_id = $1
-            and timestamp >= $2::date
-            and timestamp < $3::date",
-        )
-        .bind(user.id)
-        .bind(start)
-        .bind(end)
-        .fetch_one(&self.pool)
-        .await?;
-
-        Ok(res.0)
-    }
-
-    // Count the history for a given year
-    #[instrument(skip_all)]
-    async fn count_history_year(&self, user: &User, year: i32) -> Result<i64> {
-        let start = chrono::Utc.ymd(year, 1, 1).and_hms_nano(0, 0, 0, 0);
-        let end = start + RelativeDuration::years(1);
-
-        let res = self
-            .count_history_range(user, start.naive_utc(), end.naive_utc())
-            .await?;
-        Ok(res)
-    }
-
-    // Count the history for a given month
-    #[instrument(skip_all)]
-    async fn count_history_month(&self, user: &User, month: chrono::NaiveDate) -> Result<i64> {
-        let start = chrono::Utc
-            .ymd(month.year(), month.month(), 1)
-            .and_hms_nano(0, 0, 0, 0);
-
-        // ofc...
-        let end = if month.month() < 12 {
-            chrono::Utc
-                .ymd(month.year(), month.month() + 1, 1)
-                .and_hms_nano(0, 0, 0, 0)
-        } else {
-            chrono::Utc
-                .ymd(month.year() + 1, 1, 1)
-                .and_hms_nano(0, 0, 0, 0)
-        };
-
-        debug!("start: {}, end: {}", start, end);
-
-        let res = self
-            .count_history_range(user, start.naive_utc(), end.naive_utc())
-            .await?;
-        Ok(res)
-    }
-
-    // Count the history for a given day
-    #[instrument(skip_all)]
-    async fn count_history_day(&self, user: &User, day: chrono::NaiveDate) -> Result<i64> {
-        let start = chrono::Utc
-            .ymd(day.year(), day.month(), day.day())
-            .and_hms_nano(0, 0, 0, 0);
-        let end = chrono::Utc
-            .ymd(day.year(), day.month(), day.day() + 1)
-            .and_hms_nano(0, 0, 0, 0);
-
-        let res = self
-            .count_history_range(user, start.naive_utc(), end.naive_utc())
-            .await?;
-        Ok(res)
-    }
-
-    #[instrument(skip_all)]
-    async fn list_history(
-        &self,
-        user: &User,
-        created_after: chrono::NaiveDateTime,
-        since: chrono::NaiveDateTime,
-        host: &str,
-        page_size: i64,
-    ) -> Result<Vec<History>> {
-        let res = sqlx::query_as::<_, History>(
-            "select id, client_id, user_id, hostname, timestamp, data, created_at from history 
-            where user_id = $1
-            and hostname != $2
-            and created_at >= $3
-            and timestamp >= $4
-            order by timestamp asc
-            limit $5",
-        )
-        .bind(user.id)
-        .bind(host)
-        .bind(created_after)
-        .bind(since)
-        .bind(page_size)
-        .fetch_all(&self.pool)
-        .await?;
-
-        Ok(res)
-    }
-
-    #[instrument(skip_all)]
-    async fn add_history(&self, history: &[NewHistory]) -> Result<()> {
-        let mut tx = self.pool.begin().await?;
-
-        for i in history {
-            let client_id: &str = &i.client_id;
-            let hostname: &str = &i.hostname;
-            let data: &str = &i.data;
-
-            if data.len() > self.settings.max_history_length
-                && self.settings.max_history_length != 0
-            {
-                // Don't return an error here. We want to insert as much of the
-                // history list as we can, so log the error and continue going.
-
-                warn!(
-                    "history too long, got length {}, max {}",
-                    data.len(),
-                    self.settings.max_history_length
-                );
-
-                continue;
-            }
-
-            sqlx::query(
-                "insert into history
-                    (client_id, user_id, hostname, timestamp, data) 
-                values ($1, $2, $3, $4, $5)
-                on conflict do nothing
-                ",
-            )
-            .bind(client_id)
-            .bind(i.user_id)
-            .bind(hostname)
-            .bind(i.timestamp)
-            .bind(data)
-            .execute(&mut tx)
-            .await?;
-        }
-
-        tx.commit().await?;
-
-        Ok(())
-    }
-
-    #[instrument(skip_all)]
-    async fn delete_user(&self, u: &User) -> Result<()> {
-        sqlx::query("delete from sessions where user_id = $1")
-            .bind(u.id)
-            .execute(&self.pool)
-            .await?;
-
-        sqlx::query("delete from users where id = $1")
-            .bind(u.id)
-            .execute(&self.pool)
-            .await?;
-
-        sqlx::query("delete from history where user_id = $1")
-            .bind(u.id)
-            .execute(&self.pool)
-            .await?;
-
-        Ok(())
-    }
-
-    #[instrument(skip_all)]
-    async fn add_user(&self, user: &NewUser) -> Result<i64> {
-        let email: &str = &user.email;
-        let username: &str = &user.username;
-        let password: &str = &user.password;
-
-        let res: (i64,) = sqlx::query_as(
-            "insert into users
-                (username, email, password)
-            values($1, $2, $3)
-            returning id",
-        )
-        .bind(username)
-        .bind(email)
-        .bind(password)
-        .fetch_one(&self.pool)
-        .await?;
-
-        Ok(res.0)
-    }
-
-    #[instrument(skip_all)]
-    async fn add_session(&self, session: &NewSession) -> Result<()> {
-        let token: &str = &session.token;
-
-        sqlx::query(
-            "insert into sessions
-                (user_id, token)
-            values($1, $2)",
-        )
-        .bind(session.user_id)
-        .bind(token)
-        .execute(&self.pool)
-        .await?;
-
-        Ok(())
-    }
-
-    #[instrument(skip_all)]
-    async fn get_user_session(&self, u: &User) -> Result<Session> {
-        sqlx::query_as::<_, Session>("select id, user_id, token from sessions where user_id = $1")
-            .bind(u.id)
-            .fetch_one(&self.pool)
-            .await
-    }
-
-    #[instrument(skip_all)]
-    async fn oldest_history(&self, user: &User) -> Result<History> {
-        let res = sqlx::query_as::<_, History>(
-            "select id, client_id, user_id, hostname, timestamp, data, created_at from history 
-            where user_id = $1
-            order by timestamp asc
-            limit 1",
-        )
-        .bind(user.id)
-        .fetch_one(&self.pool)
-        .await?;
-
-        Ok(res)
-    }
-
-    #[instrument(skip_all)]
-    async fn calendar(
-        &self,
-        user: &User,
-        period: TimePeriod,
-        year: u64,
-        month: u64,
-    ) -> Result<HashMap<u64, TimePeriodInfo>> {
-        // TODO: Support different timezones. Right now we assume UTC and
-        // everything is stored as such. But it _should_ be possible to
-        // interpret the stored date with a different TZ
-
-        match period {
-            TimePeriod::YEAR => {
-                let mut ret = HashMap::new();
-                // First we need to work out how far back to calculate. Get the
-                // oldest history item
-                let oldest = self.oldest_history(user).await?.timestamp.year();
-                let current_year = chrono::Utc::now().year();
-
-                // All the years we need to get data for
-                // The upper bound is exclusive, so include current +1
-                let years = oldest..current_year + 1;
-
-                for year in years {
-                    let count = self.count_history_year(user, year).await?;
-
-                    ret.insert(
-                        year as u64,
-                        TimePeriodInfo {
-                            count: count as u64,
-                            hash: "".to_string(),
-                        },
-                    );
-                }
-
-                Ok(ret)
-            }
-
-            TimePeriod::MONTH => {
-                let mut ret = HashMap::new();
-
-                for month in 1..13 {
-                    let count = self
-                        .count_history_month(
-                            user,
-                            chrono::Utc.ymd(year as i32, month, 1).naive_utc(),
-                        )
-                        .await?;
-
-                    ret.insert(
-                        month as u64,
-                        TimePeriodInfo {
-                            count: count as u64,
-                            hash: "".to_string(),
-                        },
-                    );
-                }
-
-                Ok(ret)
-            }
-
-            TimePeriod::DAY => {
-                let mut ret = HashMap::new();
-
-                for day in 1..get_days_from_month(year as i32, month as u32) {
-                    let count = self
-                        .count_history_day(
-                            user,
-                            chrono::Utc
-                                .ymd(year as i32, month as u32, day as u32)
-                                .naive_utc(),
-                        )
-                        .await?;
-
-                    ret.insert(
-                        day as u64,
-                        TimePeriodInfo {
-                            count: count as u64,
-                            hash: "".to_string(),
-                        },
-                    );
-                }
-
-                Ok(ret)
-            }
-        }
-    }
-}
diff --git a/atuin-server/src/handlers/history.rs b/atuin-server/src/handlers/history.rs
index 1c9dff5f..bb0aa321 100644
--- a/atuin-server/src/handlers/history.rs
+++ b/atuin-server/src/handlers/history.rs
@@ -10,18 +10,20 @@ use tracing::{debug, error, instrument};
 
 use super::{ErrorResponse, ErrorResponseStatus, RespExt};
 use crate::{
-    calendar::{TimePeriod, TimePeriodInfo},
-    database::Database,
-    models::{NewHistory, User},
-    router::AppState,
+    router::{AppState, UserAuth},
     utils::client_version_min,
 };
+use atuin_server_database::{
+    calendar::{TimePeriod, TimePeriodInfo},
+    models::NewHistory,
+    Database,
+};
 
 use atuin_common::api::*;
 
 #[instrument(skip_all, fields(user.id = user.id))]
 pub async fn count<DB: Database>(
-    user: User,
+    UserAuth(user): UserAuth,
     state: State<AppState<DB>>,
 ) -> Result<Json<CountResponse>, ErrorResponseStatus<'static>> {
     let db = &state.0.database;
@@ -42,7 +44,7 @@ pub async fn count<DB: Database>(
 #[instrument(skip_all, fields(user.id = user.id))]
 pub async fn list<DB: Database>(
     req: Query<SyncHistoryRequest>,
-    user: User,
+    UserAuth(user): UserAuth,
     headers: HeaderMap,
     state: State<AppState<DB>>,
 ) -> Result<Json<SyncHistoryResponse>, ErrorResponseStatus<'static>> {
@@ -101,7 +103,7 @@ pub async fn list<DB: Database>(
 
 #[instrument(skip_all, fields(user.id = user.id))]
 pub async fn delete<DB: Database>(
-    user: User,
+    UserAuth(user): UserAuth,
     state: State<AppState<DB>>,
     Json(req): Json<DeleteHistoryRequest>,
 ) -> Result<Json<MessageResponse>, ErrorResponseStatus<'static>> {
@@ -123,13 +125,15 @@ pub async fn delete<DB: Database>(
 
 #[instrument(skip_all, fields(user.id = user.id))]
 pub async fn add<DB: Database>(
-    user: User,
+    UserAuth(user): UserAuth,
     state: State<AppState<DB>>,
     Json(req): Json<Vec<AddHistoryRequest>>,
 ) -> Result<(), ErrorResponseStatus<'static>> {
+    let State(AppState { database, settings }) = state;
+
     debug!("request to add {} history items", req.len());
 
-    let history: Vec<NewHistory> = req
+    let mut history: Vec<NewHistory> = req
         .into_iter()
         .map(|h| NewHistory {
             client_id: h.id,
@@ -140,8 +144,24 @@ pub async fn add<DB: Database>(
         })
         .collect();
 
-    let db = &state.0.database;
-    if let Err(e) = db.add_history(&history).await {
+    history.retain(|h| {
+        // keep if within limit, or limit is 0 (unlimited)
+        let keep = h.data.len() <= settings.max_history_length || settings.max_history_length == 0;
+
+        // Don't return an error here. We want to insert as much of the
+        // history list as we can, so log the error and continue going.
+        if !keep {
+            tracing::warn!(
+                "history too long, got length {}, max {}",
+                h.data.len(),
+                settings.max_history_length
+            );
+        }
+
+        keep
+    });
+
+    if let Err(e) = database.add_history(&history).await {
         error!("failed to add history: {}", e);
 
         return Err(ErrorResponse::reply("failed to add history")
@@ -155,7 +175,7 @@ pub async fn add<DB: Database>(
 pub async fn calendar<DB: Database>(
     Path(focus): Path<String>,
     Query(params): Query<HashMap<String, u64>>,
-    user: User,
+    UserAuth(user): UserAuth,
     state: State<AppState<DB>>,
 ) -> Result<Json<HashMap<u64, TimePeriodInfo>>, ErrorResponseStatus<'static>> {
     let focus = focus.as_str();
diff --git a/atuin-server/src/handlers/status.rs b/atuin-server/src/handlers/status.rs
index 97c02886..d9b6afaf 100644
--- a/atuin-server/src/handlers/status.rs
+++ b/atuin-server/src/handlers/status.rs
@@ -3,7 +3,8 @@ use http::StatusCode;
 use tracing::instrument;
 
 use super::{ErrorResponse, ErrorResponseStatus, RespExt};
-use crate::{database::Database, models::User, router::AppState};
+use crate::router::{AppState, UserAuth};
+use atuin_server_database::Database;
 
 use atuin_common::api::*;
 
@@ -11,7 +12,7 @@ const VERSION: &str = env!("CARGO_PKG_VERSION");
 
 #[instrument(skip_all, fields(user.id = user.id))]
 pub async fn status<DB: Database>(
-    user: User,
+    UserAuth(user): UserAuth,
     state: State<AppState<DB>>,
 ) -> Result<Json<StatusResponse>, ErrorResponseStatus<'static>> {
     let db = &state.0.database;
diff --git a/atuin-server/src/handlers/user.rs b/atuin-server/src/handlers/user.rs
index e67828e4..75081155 100644
--- a/atuin-server/src/handlers/user.rs
+++ b/atuin-server/src/handlers/user.rs
@@ -16,10 +16,10 @@ use tracing::{debug, error, info, instrument};
 use uuid::Uuid;
 
 use super::{ErrorResponse, ErrorResponseStatus, RespExt};
-use crate::{
-    database::Database,
-    models::{NewSession, NewUser, User},
-    router::AppState,
+use crate::router::{AppState, UserAuth};
+use atuin_server_database::{
+    models::{NewSession, NewUser},
+    Database, DbError,
 };
 
 use reqwest::header::CONTENT_TYPE;
@@ -64,11 +64,11 @@ pub async fn get<DB: Database>(
     let db = &state.0.database;
     let user = match db.get_user(username.as_ref()).await {
         Ok(user) => user,
-        Err(sqlx::Error::RowNotFound) => {
+        Err(DbError::NotFound) => {
             debug!("user not found: {}", username);
             return Err(ErrorResponse::reply("user not found").with_status(StatusCode::NOT_FOUND));
         }
-        Err(err) => {
+        Err(DbError::Other(err)) => {
             error!("database error: {}", err);
             return Err(ErrorResponse::reply("database error")
                 .with_status(StatusCode::INTERNAL_SERVER_ERROR));
@@ -152,7 +152,7 @@ pub async fn register<DB: Database>(
 
 #[instrument(skip_all, fields(user.id = user.id))]
 pub async fn delete<DB: Database>(
-    user: User,
+    UserAuth(user): UserAuth,
     state: State<AppState<DB>>,
 ) -> Result<Json<DeleteUserResponse>, ErrorResponseStatus<'static>> {
     debug!("request to delete user {}", user.id);
@@ -175,10 +175,10 @@ pub async fn login<DB: Database>(
     let db = &state.0.database;
     let user = match db.get_user(login.username.borrow()).await {
         Ok(u) => u,
-        Err(sqlx::Error::RowNotFound) => {
+        Err(DbError::NotFound) => {
             return Err(ErrorResponse::reply("user not found").with_status(StatusCode::NOT_FOUND));
         }
-        Err(e) => {
+        Err(DbError::Other(e)) => {
             error!("failed to get user {}: {}", login.username.clone(), e);
 
             return Err(ErrorResponse::reply("database error")
@@ -188,11 +188,11 @@ pub async fn login<DB: Database>(
 
     let session = match db.get_user_session(&user).await {
         Ok(u) => u,
-        Err(sqlx::Error::RowNotFound) => {
+        Err(DbError::NotFound) => {
             debug!("user session not found for user id={}", user.id);
             return Err(ErrorResponse::reply("user not found").with_status(StatusCode::NOT_FOUND));
         }
-        Err(err) => {
+        Err(DbError::Other(err)) => {
             error!("database error for user {}: {}", login.username, err);
             return Err(ErrorResponse::reply("database error")
                 .with_status(StatusCode::INTERNAL_SERVER_ERROR));
diff --git a/atuin-server/src/lib.rs b/atuin-server/src/lib.rs
index 01873af9..aa2250d3 100644
--- a/atuin-server/src/lib.rs
+++ b/atuin-server/src/lib.rs
@@ -2,45 +2,38 @@
 
 use std::net::{IpAddr, SocketAddr};
 
+use atuin_server_database::Database;
 use axum::Server;
-use database::Postgres;
 use eyre::{Context, Result};
 
-use crate::settings::Settings;
+mod handlers;
+mod router;
+mod settings;
+mod utils;
 
+pub use settings::Settings;
 use tokio::signal;
 
-pub mod auth;
-pub mod calendar;
-pub mod database;
-pub mod handlers;
-pub mod models;
-pub mod router;
-pub mod settings;
-pub mod utils;
-
 async fn shutdown_signal() {
-    let terminate = async {
-        signal::unix::signal(signal::unix::SignalKind::terminate())
-            .expect("failed to register signal handler")
-            .recv()
-            .await;
-    };
-
-    tokio::select! {
-        _ = terminate => (),
-    }
+    signal::unix::signal(signal::unix::SignalKind::terminate())
+        .expect("failed to register signal handler")
+        .recv()
+        .await;
     eprintln!("Shutting down gracefully...");
 }
 
-pub async fn launch(settings: Settings, host: String, port: u16) -> Result<()> {
+pub async fn launch<Db: Database>(
+    settings: Settings<Db::Settings>,
+    host: String,
+    port: u16,
+) -> Result<()> {
     let host = host.parse::<IpAddr>()?;
 
-    let postgres = Postgres::new(settings.clone())
+    let db = Db::new(&settings.db_settings)
         .await
-        .wrap_err_with(|| format!("failed to connect to db: {}", settings.db_uri))?;
+        .wrap_err_with(|| format!("failed to connect to db: {:?}", settings.db_settings))?;
 
-    let r = router::router(postgres, settings);
+    let r = router::router(db, settings);
 
     Server::bind(&SocketAddr::new(host, port))
         .serve(r.into_make_service())
diff --git a/atuin-server/src/router.rs b/atuin-server/src/router.rs
index 20b11f45..ec558e78 100644
--- a/atuin-server/src/router.rs
+++ b/atuin-server/src/router.rs
@@ -10,11 +10,14 @@ use http::request::Parts;
 use tower::ServiceBuilder;
 use tower_http::trace::TraceLayer;
 
-use super::{database::Database, handlers};
-use crate::{models::User, settings::Settings};
+use super::handlers;
+use crate::settings::Settings;
+use atuin_server_database::{models::User, Database};
+
+pub struct UserAuth(pub User);
 
 #[async_trait]
-impl<DB: Send + Sync> FromRequestParts<AppState<DB>> for User
+impl<DB: Send + Sync> FromRequestParts<AppState<DB>> for UserAuth
 where
     DB: Database,
 {
@@ -45,7 +48,7 @@ where
             .await
             .map_err(|_| http::StatusCode::FORBIDDEN)?;
 
-        Ok(user)
+        Ok(UserAuth(user))
     }
 }
 
@@ -54,15 +57,12 @@ async fn teapot() -> impl IntoResponse {
 }
 
 #[derive(Clone)]
-pub struct AppState<DB> {
+pub struct AppState<DB: Database> {
     pub database: DB,
-    pub settings: Settings,
+    pub settings: Settings<DB::Settings>,
 }
 
-pub fn router<DB: Database + Clone + Send + Sync + 'static>(
-    database: DB,
-    settings: Settings,
-) -> Router {
+pub fn router<DB: Database>(database: DB, settings: Settings<DB::Settings>) -> Router {
     let routes = Router::new()
         .route("/", get(handlers::index))
         .route("/sync/count", get(handlers::history::count))
diff --git a/atuin-server/src/settings.rs b/atuin-server/src/settings.rs
index 981d239f..fb5325d4 100644
--- a/atuin-server/src/settings.rs
+++ b/atuin-server/src/settings.rs
@@ -3,24 +3,24 @@ use std::{io::prelude::*, path::PathBuf};
 use config::{Config, Environment, File as ConfigFile, FileFormat};
 use eyre::{eyre, Result};
 use fs_err::{create_dir_all, File};
-use serde::{Deserialize, Serialize};
-
-pub const HISTORY_PAGE_SIZE: i64 = 100;
+use serde::{de::DeserializeOwned, Deserialize, Serialize};
 
 #[derive(Clone, Debug, Deserialize, Serialize)]
-pub struct Settings {
+pub struct Settings<DbSettings> {
     pub host: String,
     pub port: u16,
     pub path: String,
-    pub db_uri: String,
     pub open_registration: bool,
     pub max_history_length: usize,
     pub page_size: i64,
     pub register_webhook_url: Option<String>,
     pub register_webhook_username: String,
+
+    #[serde(flatten)]
+    pub db_settings: DbSettings,
 }
 
-impl Settings {
+impl<DbSettings: DeserializeOwned> Settings<DbSettings> {
     pub fn new() -> Result<Self> {
         let mut config_file = if let Ok(p) = std::env::var("ATUIN_CONFIG_DIR") {
             PathBuf::from(p)
diff --git a/atuin/Cargo.toml b/atuin/Cargo.toml
index 9085623c..bf038050 100644
--- a/atuin/Cargo.toml
+++ b/atuin/Cargo.toml
@@ -33,15 +33,13 @@ buildflags = ["--release"]
 atuin = { path = "/usr/bin/atuin" }
 
 [features]
-# TODO(conradludgate)
-# Currently, this keeps the same default built behaviour for v0.8
-# We should rethink this by the time we hit a new breaking change
 default = ["client", "sync", "server"]
 client = ["atuin-client"]
 sync = ["atuin-client/sync"]
-server = ["atuin-server", "tracing-subscriber"]
+server = ["atuin-server", "atuin-server-postgres", "tracing-subscriber"]
 
 [dependencies]
+atuin-server-postgres = { path = "../atuin-server-postgres", version = "15.0.0", optional = true }
 atuin-server = { path = "../atuin-server", version = "15.0.0", optional = true }
 atuin-client = { path = "../atuin-client", version = "15.0.0", optional = true, default-features = false }
 atuin-common = { path = "../atuin-common", version = "15.0.0" }
@@ -61,7 +59,6 @@ tokio = { workspace = true }
 async-trait = { workspace = true }
 interim = { workspace = true }
 base64 = { workspace = true }
-crossbeam-channel = "0.5.1"
 clap = { workspace = true }
 clap_complete = "4.0.3"
 fs-err = { workspace = true }
diff --git a/atuin/src/command/server.rs b/atuin/src/command/server.rs
index 495f85d0..c65cb505 100644
--- a/atuin/src/command/server.rs
+++ b/atuin/src/command/server.rs
@@ -1,9 +1,10 @@
+use atuin_server_postgres::Postgres;
 use tracing_subscriber::{fmt, prelude::*, EnvFilter};
 
 use clap::Parser;
 use eyre::{Context, Result};
 
-use atuin_server::{launch, settings::Settings};
+use atuin_server::{launch, Settings};
 
 #[derive(Parser)]
 #[clap(infer_subcommands = true)]
@@ -37,7 +38,7 @@ impl Cmd {
                     .map_or(settings.host.clone(), std::string::ToString::to_string);
                 let port = port.map_or(settings.port, |p| p);
 
-                launch(settings, host, port).await
+                launch::<Postgres>(settings, host, port).await
             }
         }
     }